Spread spectrum microwave overlay with notch filter
AssigneeInterDigital Technology Corporation
InventorDonald L. Schilling
Life of this patent
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Abstract
A base station is in a spread spectrum code division multiple access (CDMA) communication system which co-exists with a microwave system. The microwave system selectively utilizes various microwave frequencies within a selected range of frequencies. The base station generates a plurality of spread spectrum CDMA data signals using pseudo random chip code sequences. The spread data signals encompass the selected range. The base station notch filters the spread data signals at microwave frequencies within the selected range used by the microwave system. The notch filtered spread data signals are transmitted to personal communication network units.
Claims20
A base station for use in a spread spectrum code division multiple access (CDMA) communication system which co-exists with a microwave system, the microwave system selectively utilizing various microwave frequencies within a selected range of frequencies, the base station comprising:
- means for generating a plurality of spread spectrum CDMA data signals using pseudo random chip code sequences, the spread data signals encompassing the selected range;
- means for notch filtering the spread data signals at microwave frequencies within the selected range used by the microwave system;
- and
- means for transmitting the notch filtered spread data signals to personal communication network units.
A base station for use in a spread spectrum code division multiple access (CDMA) communication system which co-exists with a microwave system, the microwave frequencies within a selected range of frequencies, the base station comprising:
- a plurality of mixers for mixing data signals with pseudo random chip code sequences to generate a plurality of spread spectrum CDMA data signals, the spread data signals encompassing the selected range of microwave frequencies;
- a plurality of adaptive notch filters for notch filtering the spread data signals at microwave frequencies within the selected range used by the microwave system;
- and
- an antenna for transmitting to personal communication network units the combined signal.
A base station for use in a spread spectrum code division multiple access (CDMA) communication system which co-exits with a microwave system, the microwave frequencies within a selected range of frequencies, the base station comprising:
- a first plurality of mixers for mixing data signals with pseudo random chip code sequences to generate a plurality of spread spectrum CDMA data signals;
- a second plurality of mixers for mixing the spread data signals with an intermediate frequency (IF) signal as a plurality of IF spread data signals;
- a plurality of adaptive notch filters for notch filtering the IF data signals;
- a third plurality of mixers for mixing the filtered IF data signals with a radio frequency (RF) signal as spread RF data signals;
- wherein the spread RF data signals are effectively notch filtered at microwave frequencies within the selected ranges;
- and
- an antenna for transmitting to personal communication network units the spread RF data signals.
Dependencies are inferred from the claim text.